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Once Green Day hit the studio in 2012, they had written enough music – 37 songs – for what they first considered a double album, and then decided to release as three separate ones, beginning with this ¡Uno! Diverging from the two “punk rock operas” that preceded it, the album (featuring frontman Billie Joe Armstrong in the cover) has a punk pop sound, along with a more dance-y tune in “Kill the DJ”. This is also the first Green Day album acknowledging long-time tour guitarist Jason White as a full-fledged member.